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class="sidebar-heading"><span>实战案例</span> <!----></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/md/concurrent/ActualCombat/default.html" class="sidebar-link">关于我</a></li></ul></section></li><li><section class="sidebar-group depth-0"><p class="sidebar-heading"><span>面试</span> <!----></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/md/concurrent/interview/default.html" class="sidebar-link">关于我</a></li></ul></section></li><li><section class="sidebar-group depth-0"><p class="sidebar-heading"><span>系统架构</span> <!----></p> <ul class="sidebar-links sidebar-group-items"><li><a href="/md/concurrent/framework/default.html" class="sidebar-link">关于我</a></li></ul></section></li></ul> </aside> <div><main class="page"> <div class="theme-default-content content__default"><h1 id="浅谈aqs中的reentrantlock、reentrantreadwritelock、stampedlock与condition"><a href="#浅谈aqs中的reentrantlock、reentrantreadwritelock、stampedlock与condition" class="header-anchor">#</a> 浅谈AQS中的ReentrantLock、ReentrantReadWriteLock、StampedLock与Condition</h1> <h2 id="reentrantlock"><a href="#reentrantlock" class="header-anchor">#</a> ReentrantLock</h2> <h3 id="概述"><a href="#概述" class="header-anchor">#</a> 概述</h3> <p>Java中主要分为两类锁，一类是synchronized修饰的锁，另外一类就是J.U.C中提供的锁。J.U.C中提供的核心锁就是ReentrantLock。</p> <h5 id="reentrantlock-可重入锁-与synchronized区别"><a href="#reentrantlock-可重入锁-与synchronized区别" class="header-anchor">#</a> ReentrantLock（可重入锁）与synchronized区别：</h5> <p><strong>（1）可重入性</strong>
二者都是同一个线程进入1次，锁的计数器就自增1，需要等到锁的计数器下降为0时，才能释放锁。</p> <p><strong>（2）锁的实现</strong>
synchronized是基于JVM实现的，而ReentrantLock是JDK实现的。</p> <p><strong>（3）性能的区别</strong>
synchronized优化之前性能比ReentrantLock差很多，但是自从synchronized引入了偏向锁，轻量级锁也就是自旋锁后，性能就差不多了。</p> <p><strong>（4）功能区别</strong></p> <ul><li>便利性</li></ul> <p>synchronized使用起来比较方便，并且由编译器保证加锁和释放锁；ReentrantLock需要手工声明加锁和释放锁，最好是在finally代码块中声明释放锁。</p> <ul><li>锁的灵活度和细粒度</li></ul> <p>在这点上ReentrantLock会优于synchronized。</p> <h5 id="reentrantlock独有的功能"><a href="#reentrantlock独有的功能" class="header-anchor">#</a> ReentrantLock独有的功能</h5> <ul><li><p>ReentrantLock可指定是公平锁还是非公平锁。而synchronized只能是非公平锁。所谓的公平锁就是先等待的线程先获得锁。</p></li> <li><p>提供了一个Condition类，可以分组唤醒需要唤醒的线程。而synchronized只能随机唤醒一个线程，或者唤醒全部的线程</p></li> <li><p>提供能够中断等待锁的线程的机制，lock.lockInterruptibly()。ReentrantLock实现是一种自旋锁，通过循环调用CAS操作来实现加锁，性能上比较好是因为避免了使线程进入内核态的阻塞状态。</p></li></ul> <p>synchronized能做的事情ReentrantLock都能做，而ReentrantLock有些能做的事情，synchronized不能做。</p> <p>在性能上，ReentrantLock不会比synchronized差。</p> <h5 id="synchronized的优势"><a href="#synchronized的优势" class="header-anchor">#</a> synchronized的优势</h5> <ul><li><p>不用手动释放锁，JVM自动处理，如果出现异常，JVM也会自动释放锁。</p></li> <li><p>JVM用synchronized进行管理锁定请求和释放时，JVM在生成线程转储时能够锁定信息，这些对调试非常有价值，因为它们能标识死锁或者其他异常行为的来源。而ReentrantLock只是普通的类，JVM不知道具体哪个线程拥有lock对象。</p></li> <li><p>synchronized可以在所有JVM版本中工作，ReentrantLock在某些1.5之前版本的JVM中可能不支持。</p></li></ul> <h5 id="reentrantlock中的部分方法说明"><a href="#reentrantlock中的部分方法说明" class="header-anchor">#</a> ReentrantLock中的部分方法说明</h5> <ul><li><p>boolean tryLock():仅在调用时锁定未被另一个线程保持的情况下才获取锁定。</p></li> <li><p>boolean tryLock(long, TimeUnit): 如果锁定在给定的等待时间内没有被另一个线程保持，且当前线程没有被中断，则获取这个锁定。</p></li> <li><p>void lockInterruptibly():如果当前线程没有被中断，就获取锁定；如果被中断，就抛出异常。</p></li> <li><p>boolean isLocked():查询此锁定是否由任意线程保持。</p></li> <li><p>boolean isHeldByCurrentThread(): 查询当前线程是否保持锁定状态。</p></li> <li><p>boolean isFair():判断是否是公平锁。</p></li> <li><p>boolean hasQueuedThread(Thread)：查询指定线程是否在等待获取此锁定。</p></li> <li><p>boolean hasQueuedThreads():查询是否有线程正在等待获取此锁定。</p></li> <li><p>boolean getHoldCount():查询当前线程保持锁定的个数。</p></li></ul> <h3 id="代码示例"><a href="#代码示例" class="header-anchor">#</a> 代码示例</h3> <p>示例代码如下：</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">package</span> <span class="token namespace">io<span class="token punctuation">.</span>binghe<span class="token punctuation">.</span>concurrency<span class="token punctuation">.</span>example<span class="token punctuation">.</span>lock</span><span class="token punctuation">;</span>
 
<span class="token keyword">import</span> <span class="token import"><span class="token namespace">lombok<span class="token punctuation">.</span>extern<span class="token punctuation">.</span>slf4j<span class="token punctuation">.</span></span><span class="token class-name">Slf4j</span></span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token import"><span class="token namespace">java<span class="token punctuation">.</span>util<span class="token punctuation">.</span>concurrent<span class="token punctuation">.</span></span><span class="token class-name">CountDownLatch</span></span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token import"><span class="token namespace">java<span class="token punctuation">.</span>util<span class="token punctuation">.</span>concurrent<span class="token punctuation">.</span></span><span class="token class-name">ExecutorService</span></span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token import"><span class="token namespace">java<span class="token punctuation">.</span>util<span class="token punctuation">.</span>concurrent<span class="token punctuation">.</span></span><span class="token class-name">Executors</span></span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token import"><span class="token namespace">java<span class="token punctuation">.</span>util<span class="token punctuation">.</span>concurrent<span class="token punctuation">.</span></span><span class="token class-name">Semaphore</span></span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token import"><span class="token namespace">java<span class="token punctuation">.</span>util<span class="token punctuation">.</span>concurrent<span class="token punctuation">.</span>locks<span class="token punctuation">.</span></span><span class="token class-name">Lock</span></span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token import"><span class="token namespace">java<span class="token punctuation">.</span>util<span class="token punctuation">.</span>concurrent<span class="token punctuation">.</span>locks<span class="token punctuation">.</span></span><span class="token class-name">ReentrantLock</span></span><span class="token punctuation">;</span>
<span class="token annotation punctuation">@Slf4j</span>
<span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">LockExample</span> <span class="token punctuation">{</span>
    <span class="token comment">//请求总数</span>
    <span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">int</span> clientTotal <span class="token operator">=</span> <span class="token number">5000</span><span class="token punctuation">;</span>
    <span class="token comment">//同时并发执行的线程数</span>
    <span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">int</span> threadTotal <span class="token operator">=</span> <span class="token number">200</span><span class="token punctuation">;</span>
    <span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">int</span> count <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span>
    <span class="token keyword">private</span> <span class="token keyword">static</span> <span class="token keyword">final</span> <span class="token class-name">Lock</span> lock <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">ReentrantLock</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">void</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token class-name">String</span><span class="token punctuation">[</span><span class="token punctuation">]</span> args<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">InterruptedException</span> <span class="token punctuation">{</span>
        <span class="token class-name">ExecutorService</span> executorService <span class="token operator">=</span> <span class="token class-name">Executors</span><span class="token punctuation">.</span><span class="token function">newCachedThreadPool</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">final</span> <span class="token class-name">Semaphore</span> semaphore <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Semaphore</span><span class="token punctuation">(</span>threadTotal<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">final</span> <span class="token class-name">CountDownLatch</span> countDownLatch <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">CountDownLatch</span><span class="token punctuation">(</span>clientTotal<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">for</span><span class="token punctuation">(</span><span class="token keyword">int</span> i <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span> i <span class="token operator">&lt;</span> clientTotal<span class="token punctuation">;</span> i<span class="token operator">++</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
            executorService<span class="token punctuation">.</span><span class="token function">execute</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">-&gt;</span> <span class="token punctuation">{</span>
                <span class="token keyword">try</span><span class="token punctuation">{</span>
                    semaphore<span class="token punctuation">.</span><span class="token function">acquire</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
                    <span class="token function">add</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
                    semaphore<span class="token punctuation">.</span><span class="token function">release</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
                <span class="token punctuation">}</span><span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">Exception</span> e<span class="token punctuation">)</span><span class="token punctuation">{</span>
                    log<span class="token punctuation">.</span><span class="token function">error</span><span class="token punctuation">(</span><span class="token string">&quot;exception&quot;</span><span class="token punctuation">,</span> e<span class="token punctuation">)</span><span class="token punctuation">;</span>
                <span class="token punctuation">}</span>
                countDownLatch<span class="token punctuation">.</span><span class="token function">countDown</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
        countDownLatch<span class="token punctuation">.</span><span class="token function">await</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        executorService<span class="token punctuation">.</span><span class="token function">shutdown</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        log<span class="token punctuation">.</span><span class="token function">info</span><span class="token punctuation">(</span><span class="token string">&quot;count:{}&quot;</span><span class="token punctuation">,</span> count<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span>
    <span class="token keyword">private</span> <span class="token keyword">static</span> <span class="token keyword">void</span> <span class="token function">add</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
        lock<span class="token punctuation">.</span><span class="token function">lock</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">try</span><span class="token punctuation">{</span>
            count <span class="token operator">++</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span><span class="token keyword">finally</span> <span class="token punctuation">{</span>
            lock<span class="token punctuation">.</span><span class="token function">unlock</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
    <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br><span class="line-number">28</span><br><span class="line-number">29</span><br><span class="line-number">30</span><br><span class="line-number">31</span><br><span class="line-number">32</span><br><span class="line-number">33</span><br><span class="line-number">34</span><br><span class="line-number">35</span><br><span class="line-number">36</span><br><span class="line-number">37</span><br><span class="line-number">38</span><br><span class="line-number">39</span><br><span class="line-number">40</span><br><span class="line-number">41</span><br><span class="line-number">42</span><br><span class="line-number">43</span><br><span class="line-number">44</span><br><span class="line-number">45</span><br><span class="line-number">46</span><br></div></div><h2 id="reentrantreadwritelock"><a href="#reentrantreadwritelock" class="header-anchor">#</a> ReentrantReadWriteLock</h2> <h3 id="概述-2"><a href="#概述-2" class="header-anchor">#</a> 概述</h3> <p>在没有任何读写锁的时候，才可以取得写锁。如果一直有读锁存在，则无法执行写锁，这就会导致写锁饥饿。</p> <h3 id="代码示例-2"><a href="#代码示例-2" class="header-anchor">#</a> 代码示例</h3> <p>示例代码如下：</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">package</span> <span class="token namespace">io<span class="token punctuation">.</span>binghe<span class="token punctuation">.</span>concurrency<span class="token punctuation">.</span>example<span class="token punctuation">.</span>lock</span><span class="token punctuation">;</span>
 
<span class="token keyword">import</span> <span class="token import"><span class="token namespace">lombok<span class="token punctuation">.</span>extern<span class="token punctuation">.</span>slf4j<span class="token punctuation">.</span></span><span class="token class-name">Slf4j</span></span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token import"><span class="token namespace">java<span class="token punctuation">.</span>util<span class="token punctuation">.</span></span><span class="token class-name">Map</span></span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token import"><span class="token namespace">java<span class="token punctuation">.</span>util<span class="token punctuation">.</span></span><span class="token class-name">Set</span></span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token import"><span class="token namespace">java<span class="token punctuation">.</span>util<span class="token punctuation">.</span></span><span class="token class-name">TreeMap</span></span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token import"><span class="token namespace">java<span class="token punctuation">.</span>util<span class="token punctuation">.</span>concurrent<span class="token punctuation">.</span>locks<span class="token punctuation">.</span></span><span class="token class-name">Lock</span></span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token import"><span class="token namespace">java<span class="token punctuation">.</span>util<span class="token punctuation">.</span>concurrent<span class="token punctuation">.</span>locks<span class="token punctuation">.</span></span><span class="token class-name">ReentrantLock</span></span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token import"><span class="token namespace">java<span class="token punctuation">.</span>util<span class="token punctuation">.</span>concurrent<span class="token punctuation">.</span>locks<span class="token punctuation">.</span></span><span class="token class-name">ReentrantReadWriteLock</span></span><span class="token punctuation">;</span>
<span class="token annotation punctuation">@Slf4j</span>
<span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">LockExample</span> <span class="token punctuation">{</span>
 
    <span class="token keyword">private</span> <span class="token keyword">final</span> <span class="token class-name">Map</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">String</span><span class="token punctuation">,</span> <span class="token class-name">Data</span><span class="token punctuation">&gt;</span></span> map <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">TreeMap</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token punctuation">&gt;</span></span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">private</span> <span class="token keyword">final</span> <span class="token class-name">ReentrantReadWriteLock</span> lock <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">ReentrantReadWriteLock</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">private</span> <span class="token keyword">final</span> <span class="token class-name">Lock</span> readLock <span class="token operator">=</span> lock<span class="token punctuation">.</span><span class="token function">readLock</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token keyword">private</span> <span class="token keyword">final</span> <span class="token class-name">Lock</span> writeLock <span class="token operator">=</span> lock<span class="token punctuation">.</span><span class="token function">writeLock</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
 
    <span class="token keyword">public</span> <span class="token class-name">Data</span> <span class="token function">get</span><span class="token punctuation">(</span><span class="token class-name">String</span> key<span class="token punctuation">)</span><span class="token punctuation">{</span>
        readLock<span class="token punctuation">.</span><span class="token function">lock</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">try</span><span class="token punctuation">{</span>
            <span class="token keyword">return</span> map<span class="token punctuation">.</span><span class="token function">get</span><span class="token punctuation">(</span>key<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span><span class="token keyword">finally</span> <span class="token punctuation">{</span>
            readLock<span class="token punctuation">.</span><span class="token function">unlock</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
    <span class="token punctuation">}</span>
 
    <span class="token keyword">public</span> <span class="token class-name">Set</span><span class="token generics"><span class="token punctuation">&lt;</span><span class="token class-name">String</span><span class="token punctuation">&gt;</span></span> <span class="token function">getAllKeys</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
        readLock<span class="token punctuation">.</span><span class="token function">lock</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">try</span><span class="token punctuation">{</span>
            <span class="token keyword">return</span> map<span class="token punctuation">.</span><span class="token function">keySet</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span><span class="token keyword">finally</span> <span class="token punctuation">{</span>
            readLock<span class="token punctuation">.</span><span class="token function">unlock</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
    <span class="token punctuation">}</span>
 
    <span class="token keyword">public</span> <span class="token class-name">Data</span> <span class="token function">put</span><span class="token punctuation">(</span><span class="token class-name">String</span> key<span class="token punctuation">,</span> <span class="token class-name">Data</span> value<span class="token punctuation">)</span><span class="token punctuation">{</span>
        writeLock<span class="token punctuation">.</span><span class="token function">lock</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">try</span><span class="token punctuation">{</span>
            <span class="token keyword">return</span> map<span class="token punctuation">.</span><span class="token function">put</span><span class="token punctuation">(</span>key<span class="token punctuation">,</span> value<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span><span class="token keyword">finally</span> <span class="token punctuation">{</span>
            writeLock<span class="token punctuation">.</span><span class="token function">unlock</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
    <span class="token punctuation">}</span>
 
    <span class="token keyword">class</span> <span class="token class-name">Data</span><span class="token punctuation">{</span>
 
    <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br><span class="line-number">28</span><br><span class="line-number">29</span><br><span class="line-number">30</span><br><span class="line-number">31</span><br><span class="line-number">32</span><br><span class="line-number">33</span><br><span class="line-number">34</span><br><span class="line-number">35</span><br><span class="line-number">36</span><br><span class="line-number">37</span><br><span class="line-number">38</span><br><span class="line-number">39</span><br><span class="line-number">40</span><br><span class="line-number">41</span><br><span class="line-number">42</span><br><span class="line-number">43</span><br><span class="line-number">44</span><br><span class="line-number">45</span><br><span class="line-number">46</span><br><span class="line-number">47</span><br><span class="line-number">48</span><br></div></div><h2 id="stampedlock"><a href="#stampedlock" class="header-anchor">#</a> StampedLock</h2> <h3 id="概述-3"><a href="#概述-3" class="header-anchor">#</a> 概述</h3> <p>控制锁三种模式：写、读、乐观读。</p> <p>StampedLock的状态由版本和模式两个部分组成，锁获取方法返回的是一个数字作为票据，用相应的锁状态来表示并控制相关的访问，数字0表示没有写锁被授权访问。</p> <p>在读锁上分为悲观锁和乐观锁，乐观读就是在读操作很多，写操作很少的情况下，可以乐观的认为写入和读取同时发生的几率很小。因此，不悲观的使用完全的读取锁定。程序可以查看读取资料之后，是否遭到写入进行了变更，再采取后续的措施，这样的改进可以大幅度提升程序的吞吐量。</p> <p>总之，在读线程越来越多的场景下，StampedLock大幅度提升了程序的吞吐量。</p> <p>StampedLock源码中的案例如下，这里加上了注释。</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">class</span> <span class="token class-name">Point</span> <span class="token punctuation">{</span>
	<span class="token keyword">private</span> <span class="token keyword">double</span> x<span class="token punctuation">,</span> y<span class="token punctuation">;</span>
	<span class="token keyword">private</span> <span class="token keyword">final</span> <span class="token class-name">StampedLock</span> sl <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">StampedLock</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
 
	<span class="token keyword">void</span> <span class="token function">move</span><span class="token punctuation">(</span><span class="token keyword">double</span> deltaX<span class="token punctuation">,</span> <span class="token keyword">double</span> deltaY<span class="token punctuation">)</span> <span class="token punctuation">{</span> <span class="token comment">// an exclusively locked method</span>
		<span class="token keyword">long</span> stamp <span class="token operator">=</span> sl<span class="token punctuation">.</span><span class="token function">writeLock</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
		<span class="token keyword">try</span> <span class="token punctuation">{</span>
			x <span class="token operator">+=</span> deltaX<span class="token punctuation">;</span>
			y <span class="token operator">+=</span> deltaY<span class="token punctuation">;</span>
		<span class="token punctuation">}</span> <span class="token keyword">finally</span> <span class="token punctuation">{</span>
			sl<span class="token punctuation">.</span><span class="token function">unlockWrite</span><span class="token punctuation">(</span>stamp<span class="token punctuation">)</span><span class="token punctuation">;</span>
		<span class="token punctuation">}</span>
	<span class="token punctuation">}</span>
 
	<span class="token comment">//下面看看乐观读锁案例</span>
	<span class="token keyword">double</span> <span class="token function">distanceFromOrigin</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> <span class="token comment">// A read-only method</span>
		<span class="token keyword">long</span> stamp <span class="token operator">=</span> sl<span class="token punctuation">.</span><span class="token function">tryOptimisticRead</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">//获得一个乐观读锁</span>
		<span class="token keyword">double</span> currentX <span class="token operator">=</span> x<span class="token punctuation">,</span> currentY <span class="token operator">=</span> y<span class="token punctuation">;</span>  <span class="token comment">//将两个字段读入本地局部变量</span>
		<span class="token keyword">if</span> <span class="token punctuation">(</span><span class="token operator">!</span>sl<span class="token punctuation">.</span><span class="token function">validate</span><span class="token punctuation">(</span>stamp<span class="token punctuation">)</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> <span class="token comment">//检查发出乐观读锁后同时是否有其他写锁发生？</span>
			stamp <span class="token operator">=</span> sl<span class="token punctuation">.</span><span class="token function">readLock</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>  <span class="token comment">//如果没有，我们再次获得一个读悲观锁</span>
			<span class="token keyword">try</span> <span class="token punctuation">{</span>
				currentX <span class="token operator">=</span> x<span class="token punctuation">;</span> <span class="token comment">// 将两个字段读入本地局部变量</span>
				currentY <span class="token operator">=</span> y<span class="token punctuation">;</span> <span class="token comment">// 将两个字段读入本地局部变量</span>
			<span class="token punctuation">}</span> <span class="token keyword">finally</span> <span class="token punctuation">{</span>
				sl<span class="token punctuation">.</span><span class="token function">unlockRead</span><span class="token punctuation">(</span>stamp<span class="token punctuation">)</span><span class="token punctuation">;</span>
			<span class="token punctuation">}</span>
		<span class="token punctuation">}</span>
		<span class="token keyword">return</span> <span class="token class-name">Math</span><span class="token punctuation">.</span><span class="token function">sqrt</span><span class="token punctuation">(</span>currentX <span class="token operator">*</span> currentX <span class="token operator">+</span> currentY <span class="token operator">*</span> currentY<span class="token punctuation">)</span><span class="token punctuation">;</span>
	<span class="token punctuation">}</span>
 
	<span class="token comment">//下面是悲观读锁案例</span>
	<span class="token keyword">void</span> <span class="token function">moveIfAtOrigin</span><span class="token punctuation">(</span><span class="token keyword">double</span> newX<span class="token punctuation">,</span> <span class="token keyword">double</span> newY<span class="token punctuation">)</span> <span class="token punctuation">{</span> <span class="token comment">// upgrade</span>
		<span class="token comment">// Could instead start with optimistic, not read mode</span>
		<span class="token keyword">long</span> stamp <span class="token operator">=</span> sl<span class="token punctuation">.</span><span class="token function">readLock</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
		<span class="token keyword">try</span> <span class="token punctuation">{</span>
			<span class="token keyword">while</span> <span class="token punctuation">(</span>x <span class="token operator">==</span> <span class="token number">0.0</span> <span class="token operator">&amp;&amp;</span> y <span class="token operator">==</span> <span class="token number">0.0</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> <span class="token comment">//循环，检查当前状态是否符合</span>
				<span class="token keyword">long</span> ws <span class="token operator">=</span> sl<span class="token punctuation">.</span><span class="token function">tryConvertToWriteLock</span><span class="token punctuation">(</span>stamp<span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">//将读锁转为写锁</span>
				<span class="token keyword">if</span> <span class="token punctuation">(</span>ws <span class="token operator">!=</span> <span class="token number">0L</span><span class="token punctuation">)</span> <span class="token punctuation">{</span> <span class="token comment">//这是确认转为写锁是否成功</span>
					stamp <span class="token operator">=</span> ws<span class="token punctuation">;</span> <span class="token comment">//如果成功 替换票据</span>
					x <span class="token operator">=</span> newX<span class="token punctuation">;</span> <span class="token comment">//进行状态改变</span>
					y <span class="token operator">=</span> newY<span class="token punctuation">;</span>  <span class="token comment">//进行状态改变</span>
					<span class="token keyword">break</span><span class="token punctuation">;</span>
				<span class="token punctuation">}</span> <span class="token keyword">else</span> <span class="token punctuation">{</span> <span class="token comment">//如果不能成功转换为写锁</span>
					sl<span class="token punctuation">.</span><span class="token function">unlockRead</span><span class="token punctuation">(</span>stamp<span class="token punctuation">)</span><span class="token punctuation">;</span>  <span class="token comment">//我们显式释放读锁</span>
					stamp <span class="token operator">=</span> sl<span class="token punctuation">.</span><span class="token function">writeLock</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>  <span class="token comment">//显式直接进行写锁 然后再通过循环再试</span>
				<span class="token punctuation">}</span>
			<span class="token punctuation">}</span>
		<span class="token punctuation">}</span> <span class="token keyword">finally</span> <span class="token punctuation">{</span>
			sl<span class="token punctuation">.</span><span class="token function">unlock</span><span class="token punctuation">(</span>stamp<span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">//释放读锁或写锁</span>
		<span class="token punctuation">}</span>
	<span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br><span class="line-number">28</span><br><span class="line-number">29</span><br><span class="line-number">30</span><br><span class="line-number">31</span><br><span class="line-number">32</span><br><span class="line-number">33</span><br><span class="line-number">34</span><br><span class="line-number">35</span><br><span class="line-number">36</span><br><span class="line-number">37</span><br><span class="line-number">38</span><br><span class="line-number">39</span><br><span class="line-number">40</span><br><span class="line-number">41</span><br><span class="line-number">42</span><br><span class="line-number">43</span><br><span class="line-number">44</span><br><span class="line-number">45</span><br><span class="line-number">46</span><br><span class="line-number">47</span><br><span class="line-number">48</span><br><span class="line-number">49</span><br><span class="line-number">50</span><br><span class="line-number">51</span><br><span class="line-number">52</span><br></div></div><h3 id="代码示例-3"><a href="#代码示例-3" class="header-anchor">#</a> 代码示例</h3> <p>示例代码如下：</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">package</span> <span class="token namespace">io<span class="token punctuation">.</span>binghe<span class="token punctuation">.</span>concurrency<span class="token punctuation">.</span>example<span class="token punctuation">.</span>lock</span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token import"><span class="token namespace">lombok<span class="token punctuation">.</span>extern<span class="token punctuation">.</span>slf4j<span class="token punctuation">.</span></span><span class="token class-name">Slf4j</span></span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token import"><span class="token namespace">java<span class="token punctuation">.</span>util<span class="token punctuation">.</span>concurrent<span class="token punctuation">.</span></span><span class="token class-name">CountDownLatch</span></span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token import"><span class="token namespace">java<span class="token punctuation">.</span>util<span class="token punctuation">.</span>concurrent<span class="token punctuation">.</span></span><span class="token class-name">ExecutorService</span></span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token import"><span class="token namespace">java<span class="token punctuation">.</span>util<span class="token punctuation">.</span>concurrent<span class="token punctuation">.</span></span><span class="token class-name">Executors</span></span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token import"><span class="token namespace">java<span class="token punctuation">.</span>util<span class="token punctuation">.</span>concurrent<span class="token punctuation">.</span></span><span class="token class-name">Semaphore</span></span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token import"><span class="token namespace">java<span class="token punctuation">.</span>util<span class="token punctuation">.</span>concurrent<span class="token punctuation">.</span>locks<span class="token punctuation">.</span></span><span class="token class-name">StampedLock</span></span><span class="token punctuation">;</span>
<span class="token annotation punctuation">@Slf4j</span>
<span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">LockExample</span> <span class="token punctuation">{</span>
    <span class="token comment">//请求总数</span>
    <span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">int</span> clientTotal <span class="token operator">=</span> <span class="token number">5000</span><span class="token punctuation">;</span>
    <span class="token comment">//同时并发执行的线程数</span>
    <span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">int</span> threadTotal <span class="token operator">=</span> <span class="token number">200</span><span class="token punctuation">;</span>
 
    <span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">int</span> count <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span>
 
    <span class="token keyword">private</span> <span class="token keyword">static</span> <span class="token keyword">final</span> <span class="token class-name">StampedLock</span> lock <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">StampedLock</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
 
    <span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">void</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token class-name">String</span><span class="token punctuation">[</span><span class="token punctuation">]</span> args<span class="token punctuation">)</span> <span class="token keyword">throws</span> <span class="token class-name">InterruptedException</span> <span class="token punctuation">{</span>
        <span class="token class-name">ExecutorService</span> executorService <span class="token operator">=</span> <span class="token class-name">Executors</span><span class="token punctuation">.</span><span class="token function">newCachedThreadPool</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">final</span> <span class="token class-name">Semaphore</span> semaphore <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">Semaphore</span><span class="token punctuation">(</span>threadTotal<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">final</span> <span class="token class-name">CountDownLatch</span> countDownLatch <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">CountDownLatch</span><span class="token punctuation">(</span>clientTotal<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">for</span><span class="token punctuation">(</span><span class="token keyword">int</span> i <span class="token operator">=</span> <span class="token number">0</span><span class="token punctuation">;</span> i <span class="token operator">&lt;</span> clientTotal<span class="token punctuation">;</span> i<span class="token operator">++</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
            executorService<span class="token punctuation">.</span><span class="token function">execute</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">-&gt;</span> <span class="token punctuation">{</span>
                <span class="token keyword">try</span><span class="token punctuation">{</span>
                    semaphore<span class="token punctuation">.</span><span class="token function">acquire</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
                    <span class="token function">add</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
                    semaphore<span class="token punctuation">.</span><span class="token function">release</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
                <span class="token punctuation">}</span><span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">Exception</span> e<span class="token punctuation">)</span><span class="token punctuation">{</span>
                    log<span class="token punctuation">.</span><span class="token function">error</span><span class="token punctuation">(</span><span class="token string">&quot;exception&quot;</span><span class="token punctuation">,</span> e<span class="token punctuation">)</span><span class="token punctuation">;</span>
                <span class="token punctuation">}</span>
                countDownLatch<span class="token punctuation">.</span><span class="token function">countDown</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
        countDownLatch<span class="token punctuation">.</span><span class="token function">await</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        executorService<span class="token punctuation">.</span><span class="token function">shutdown</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        log<span class="token punctuation">.</span><span class="token function">info</span><span class="token punctuation">(</span><span class="token string">&quot;count:{}&quot;</span><span class="token punctuation">,</span> count<span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span>
 
    <span class="token keyword">private</span> <span class="token keyword">static</span> <span class="token keyword">void</span> <span class="token function">add</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">{</span>
	<span class="token comment">//加锁时返回一个long类型的票据</span>
        <span class="token keyword">long</span> stamp <span class="token operator">=</span> lock<span class="token punctuation">.</span><span class="token function">writeLock</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token keyword">try</span><span class="token punctuation">{</span>
            count <span class="token operator">++</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span><span class="token keyword">finally</span> <span class="token punctuation">{</span>
	    <span class="token comment">//释放锁的时候带上加锁时返回的票据</span>
            lock<span class="token punctuation">.</span><span class="token function">unlock</span><span class="token punctuation">(</span>stamp<span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span>
    <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br><span class="line-number">28</span><br><span class="line-number">29</span><br><span class="line-number">30</span><br><span class="line-number">31</span><br><span class="line-number">32</span><br><span class="line-number">33</span><br><span class="line-number">34</span><br><span class="line-number">35</span><br><span class="line-number">36</span><br><span class="line-number">37</span><br><span class="line-number">38</span><br><span class="line-number">39</span><br><span class="line-number">40</span><br><span class="line-number">41</span><br><span class="line-number">42</span><br><span class="line-number">43</span><br><span class="line-number">44</span><br><span class="line-number">45</span><br><span class="line-number">46</span><br><span class="line-number">47</span><br><span class="line-number">48</span><br><span class="line-number">49</span><br><span class="line-number">50</span><br></div></div><p><font color="#FF0000"><strong>我们可以这样选择使用synchronozed锁还是ReentrantLock锁：</strong></font></p> <ul><li><p>当只有少量竞争者时，synchronized是一个很好的通用锁实现</p></li> <li><p>竞争者不少，但是线程的增长趋势是可预估的，此时，ReentrantLock是一个很好的通用锁实现</p></li> <li><p>synchronized不会引发死锁，其他的锁使用不当可能会引发死锁。</p></li></ul> <h2 id="condition"><a href="#condition" class="header-anchor">#</a> Condition</h2> <h3 id="概述-4"><a href="#概述-4" class="header-anchor">#</a> 概述</h3> <p>Condition是一个多线程间协调通信的工具类，Condition除了实现wait和notify的功能以外，它的好处在于一个lock可以创建多个Condition，可以选择性的通知wait的线程</p> <p><strong>特点：</strong></p> <ul><li><p>Condition 的前提是Lock，由AQS中newCondition()方法 创建Condition的对象</p></li> <li><p>Condition await方法表示线程从AQS中移除，并释放线程获取的锁，并进入Condition等待队列中等待，等待被signal</p></li> <li><p>Condition signal方法表示唤醒对应Condition等待队列中的线程节点，并加入AQS中，准备去获取锁。</p></li></ul> <h3 id="代码示例-4"><a href="#代码示例-4" class="header-anchor">#</a> 代码示例</h3> <p>示例代码如下</p> <div class="language-java line-numbers-mode"><pre class="language-java"><code><span class="token keyword">package</span> <span class="token namespace">io<span class="token punctuation">.</span>binghe<span class="token punctuation">.</span>concurrency<span class="token punctuation">.</span>example<span class="token punctuation">.</span>lock</span><span class="token punctuation">;</span>
 
<span class="token keyword">import</span> <span class="token import"><span class="token namespace">lombok<span class="token punctuation">.</span>extern<span class="token punctuation">.</span>slf4j<span class="token punctuation">.</span></span><span class="token class-name">Slf4j</span></span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token import"><span class="token namespace">java<span class="token punctuation">.</span>util<span class="token punctuation">.</span>concurrent<span class="token punctuation">.</span>locks<span class="token punctuation">.</span></span><span class="token class-name">Condition</span></span><span class="token punctuation">;</span>
<span class="token keyword">import</span> <span class="token import"><span class="token namespace">java<span class="token punctuation">.</span>util<span class="token punctuation">.</span>concurrent<span class="token punctuation">.</span>locks<span class="token punctuation">.</span></span><span class="token class-name">ReentrantLock</span></span><span class="token punctuation">;</span>
<span class="token annotation punctuation">@Slf4j</span>
<span class="token keyword">public</span> <span class="token keyword">class</span> <span class="token class-name">LockExample</span> <span class="token punctuation">{</span>
    <span class="token keyword">public</span> <span class="token keyword">static</span> <span class="token keyword">void</span> <span class="token function">main</span><span class="token punctuation">(</span><span class="token class-name">String</span><span class="token punctuation">[</span><span class="token punctuation">]</span> args<span class="token punctuation">)</span> <span class="token punctuation">{</span>
        <span class="token class-name">ReentrantLock</span> reentrantLock <span class="token operator">=</span> <span class="token keyword">new</span> <span class="token class-name">ReentrantLock</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token class-name">Condition</span> condition <span class="token operator">=</span> reentrantLock<span class="token punctuation">.</span><span class="token function">newCondition</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
 
        <span class="token keyword">new</span> <span class="token class-name">Thread</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">-&gt;</span> <span class="token punctuation">{</span>
            <span class="token keyword">try</span> <span class="token punctuation">{</span>
                reentrantLock<span class="token punctuation">.</span><span class="token function">lock</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
                log<span class="token punctuation">.</span><span class="token function">info</span><span class="token punctuation">(</span><span class="token string">&quot;wait signal&quot;</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// 1</span>
                condition<span class="token punctuation">.</span><span class="token function">await</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token punctuation">}</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">InterruptedException</span> e<span class="token punctuation">)</span> <span class="token punctuation">{</span>
                e<span class="token punctuation">.</span><span class="token function">printStackTrace</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token punctuation">}</span>
            log<span class="token punctuation">.</span><span class="token function">info</span><span class="token punctuation">(</span><span class="token string">&quot;get signal&quot;</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// 4</span>
            reentrantLock<span class="token punctuation">.</span><span class="token function">unlock</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">start</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
 
        <span class="token keyword">new</span> <span class="token class-name">Thread</span><span class="token punctuation">(</span><span class="token punctuation">(</span><span class="token punctuation">)</span> <span class="token operator">-&gt;</span> <span class="token punctuation">{</span>
            reentrantLock<span class="token punctuation">.</span><span class="token function">lock</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            log<span class="token punctuation">.</span><span class="token function">info</span><span class="token punctuation">(</span><span class="token string">&quot;get lock&quot;</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// 2</span>
            <span class="token keyword">try</span> <span class="token punctuation">{</span>
                <span class="token class-name">Thread</span><span class="token punctuation">.</span><span class="token function">sleep</span><span class="token punctuation">(</span><span class="token number">3000</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token punctuation">}</span> <span class="token keyword">catch</span> <span class="token punctuation">(</span><span class="token class-name">InterruptedException</span> e<span class="token punctuation">)</span> <span class="token punctuation">{</span>
                e<span class="token punctuation">.</span><span class="token function">printStackTrace</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            <span class="token punctuation">}</span>
            condition<span class="token punctuation">.</span><span class="token function">signalAll</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
            log<span class="token punctuation">.</span><span class="token function">info</span><span class="token punctuation">(</span><span class="token string">&quot;send signal ~ &quot;</span><span class="token punctuation">)</span><span class="token punctuation">;</span> <span class="token comment">// 3</span>
            reentrantLock<span class="token punctuation">.</span><span class="token function">unlock</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
        <span class="token punctuation">}</span><span class="token punctuation">)</span><span class="token punctuation">.</span><span class="token function">start</span><span class="token punctuation">(</span><span class="token punctuation">)</span><span class="token punctuation">;</span>
    <span class="token punctuation">}</span>
<span class="token punctuation">}</span>
</code></pre> <div class="line-numbers-wrapper"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br><span class="line-number">28</span><br><span class="line-number">29</span><br><span class="line-number">30</span><br><span class="line-number">31</span><br><span class="line-number">32</span><br><span class="line-number">33</span><br><span class="line-number">34</span><br><span class="line-number">35</span><br><span class="line-number">36</span><br><span class="line-number">37</span><br></div></div><h2 id="写在最后"><a href="#写在最后" class="header-anchor">#</a> 写在最后</h2> <blockquote><p>如果觉得文章对你有点帮助，请微信搜索并关注「 <strong>冰河技术</strong> 」微信公众号，跟冰河学习高并发编程技术。</p></blockquote> <p>最后，附上并发编程需要掌握的核心技能知识图，祝大家在学习并发编程时，少走弯路。</p> <p><img alt="" data-src="https://img-blog.csdnimg.cn/20200322144644983.jpg?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2wxMDI4Mzg2ODA0,size_16,color_FFFFFF,t_70#pic_center" loading="lazy" class="lazy"></p> <blockquote><p>如果你觉得冰河写的还不错，请微信搜索并关注「 <strong>冰河技术</strong> 」微信公众号，跟冰河学习高并发、分布式、微服务、大数据、互联网和云原生技术，「 <strong>冰河技术</strong> 」微信公众号更新了大量技术专题，每一篇技术文章干货满满！不少读者已经通过阅读「 <strong>冰河技术</strong> 」微信公众号文章，吊打面试官，成功跳槽到大厂；也有不少读者实现了技术上的飞跃，成为公司的技术骨干！如果你也想像他们一样提升自己的能力，实现技术能力的飞跃，进大厂，升职加薪，那就关注「 <strong>冰河技术</strong> 」微信公众号吧，每天更新超硬核技术干货，让你对如何提升技术能力不再迷茫！</p></blockquote> <p><img alt="" data-src="https://img-blog.csdnimg.cn/20200906013715889.png" loading="lazy" class="lazy"></p></div> <footer class="page-edit"><div class="edit-link"><a href="https://github.com/binghe001/BingheGuide/edit/master/docs/md/concurrent/source/2020-03-30-016-浅谈AQS中的ReentrantLock、ReentrantReadWriteLock、StampedLock与Condition.md" target="_blank" rel="noopener noreferrer">在 GitHub 上编辑此页</a> <span><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" x="0px" y="0px" viewBox="0 0 100 100" width="15" height="15" class="icon outbound"><path fill="currentColor" d="M18.8,85.1h56l0,0c2.2,0,4-1.8,4-4v-32h-8v28h-48v-48h28v-8h-32l0,0c-2.2,0-4,1.8-4,4v56C14.8,83.3,16.6,85.1,18.8,85.1z"></path> <polygon fill="currentColor" points="45.7,48.7 51.3,54.3 77.2,28.5 77.2,37.2 85.2,37.2 85.2,14.9 62.8,14.9 62.8,22.9 71.5,22.9"></polygon></svg> <span class="sr-only">(opens new window)</span></span></div> <div class="last-updated"><span class="prefix">上次更新: </span> <span class="time">2022/5/23</span></div></footer> <div class="page-nav"><p class="inner"><span class="prev">
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      </span></p></div> </main></div> <aside class="page-sidebar"> <div class="page-side-toolbar"><div class="option-box-toc-fixed"><div class="toc-container-sidebar"><div class="pos-box"><div class="icon-arrow"></div> <div class="scroll-box" style="max-height:650px"><div style="font-weight:bold;text-align:center;">浅谈AQS中的ReentrantLock、ReentrantReadWriteLock、StampedLock与Condition</div> <hr> <div class="toc-box"><ul class="toc-sidebar-links"><li><a href="/md/concurrent/source/2020-03-30-016-%E6%B5%85%E8%B0%88AQS%E4%B8%AD%E7%9A%84ReentrantLock%E3%80%81ReentrantReadWriteLock%E3%80%81StampedLock%E4%B8%8ECondition.html#reentrantlock" class="toc-sidebar-link">ReentrantLock</a><ul class="toc-sidebar-sub-headers"><li class="toc-sidebar-sub-header"><a href="/md/concurrent/source/2020-03-30-016-%E6%B5%85%E8%B0%88AQS%E4%B8%AD%E7%9A%84ReentrantLock%E3%80%81ReentrantReadWriteLock%E3%80%81StampedLock%E4%B8%8ECondition.html#概述" class="toc-sidebar-link">概述</a></li><li class="toc-sidebar-sub-header"><a href="/md/concurrent/source/2020-03-30-016-%E6%B5%85%E8%B0%88AQS%E4%B8%AD%E7%9A%84ReentrantLock%E3%80%81ReentrantReadWriteLock%E3%80%81StampedLock%E4%B8%8ECondition.html#代码示例" class="toc-sidebar-link">代码示例</a></li></ul></li><li><a href="/md/concurrent/source/2020-03-30-016-%E6%B5%85%E8%B0%88AQS%E4%B8%AD%E7%9A%84ReentrantLock%E3%80%81ReentrantReadWriteLock%E3%80%81StampedLock%E4%B8%8ECondition.html#reentrantreadwritelock" class="toc-sidebar-link">ReentrantReadWriteLock</a><ul class="toc-sidebar-sub-headers"><li class="toc-sidebar-sub-header"><a href="/md/concurrent/source/2020-03-30-016-%E6%B5%85%E8%B0%88AQS%E4%B8%AD%E7%9A%84ReentrantLock%E3%80%81ReentrantReadWriteLock%E3%80%81StampedLock%E4%B8%8ECondition.html#概述-2" class="toc-sidebar-link">概述</a></li><li class="toc-sidebar-sub-header"><a href="/md/concurrent/source/2020-03-30-016-%E6%B5%85%E8%B0%88AQS%E4%B8%AD%E7%9A%84ReentrantLock%E3%80%81ReentrantReadWriteLock%E3%80%81StampedLock%E4%B8%8ECondition.html#代码示例-2" class="toc-sidebar-link">代码示例</a></li></ul></li><li><a href="/md/concurrent/source/2020-03-30-016-%E6%B5%85%E8%B0%88AQS%E4%B8%AD%E7%9A%84ReentrantLock%E3%80%81ReentrantReadWriteLock%E3%80%81StampedLock%E4%B8%8ECondition.html#stampedlock" class="toc-sidebar-link">StampedLock</a><ul class="toc-sidebar-sub-headers"><li class="toc-sidebar-sub-header"><a href="/md/concurrent/source/2020-03-30-016-%E6%B5%85%E8%B0%88AQS%E4%B8%AD%E7%9A%84ReentrantLock%E3%80%81ReentrantReadWriteLock%E3%80%81StampedLock%E4%B8%8ECondition.html#概述-3" class="toc-sidebar-link">概述</a></li><li class="toc-sidebar-sub-header"><a href="/md/concurrent/source/2020-03-30-016-%E6%B5%85%E8%B0%88AQS%E4%B8%AD%E7%9A%84ReentrantLock%E3%80%81ReentrantReadWriteLock%E3%80%81StampedLock%E4%B8%8ECondition.html#代码示例-3" class="toc-sidebar-link">代码示例</a></li></ul></li><li><a href="/md/concurrent/source/2020-03-30-016-%E6%B5%85%E8%B0%88AQS%E4%B8%AD%E7%9A%84ReentrantLock%E3%80%81ReentrantReadWriteLock%E3%80%81StampedLock%E4%B8%8ECondition.html#condition" class="toc-sidebar-link">Condition</a><ul class="toc-sidebar-sub-headers"><li class="toc-sidebar-sub-header"><a href="/md/concurrent/source/2020-03-30-016-%E6%B5%85%E8%B0%88AQS%E4%B8%AD%E7%9A%84ReentrantLock%E3%80%81ReentrantReadWriteLock%E3%80%81StampedLock%E4%B8%8ECondition.html#概述-4" class="toc-sidebar-link">概述</a></li><li class="toc-sidebar-sub-header"><a href="/md/concurrent/source/2020-03-30-016-%E6%B5%85%E8%B0%88AQS%E4%B8%AD%E7%9A%84ReentrantLock%E3%80%81ReentrantReadWriteLock%E3%80%81StampedLock%E4%B8%8ECondition.html#代码示例-4" class="toc-sidebar-link">代码示例</a></li></ul></li><li><a href="/md/concurrent/source/2020-03-30-016-%E6%B5%85%E8%B0%88AQS%E4%B8%AD%E7%9A%84ReentrantLock%E3%80%81ReentrantReadWriteLock%E3%80%81StampedLock%E4%B8%8ECondition.html#写在最后" class="toc-sidebar-link">写在最后</a><ul class="toc-sidebar-sub-headers"></ul></li></ul></div></div></div></div></div> <div class="option-box-toc-over"><img src="/images/system/toc.png" class="nozoom"> <span class="show-txt">目录</span> <div class="toc-container"><div class="pos-box"><div class="icon-arrow"></div> <div class="scroll-box" style="max-height:550px"><div style="font-weight:bold;text-align:center;">浅谈AQS中的ReentrantLock、ReentrantReadWriteLock、StampedLock与Condition</div> <hr> <div class="toc-box"><ul class="toc-sidebar-links"><li><a href="/md/concurrent/source/2020-03-30-016-%E6%B5%85%E8%B0%88AQS%E4%B8%AD%E7%9A%84ReentrantLock%E3%80%81ReentrantReadWriteLock%E3%80%81StampedLock%E4%B8%8ECondition.html#reentrantlock" class="toc-sidebar-link">ReentrantLock</a><ul class="toc-sidebar-sub-headers"><li class="toc-sidebar-sub-header"><a href="/md/concurrent/source/2020-03-30-016-%E6%B5%85%E8%B0%88AQS%E4%B8%AD%E7%9A%84ReentrantLock%E3%80%81ReentrantReadWriteLock%E3%80%81StampedLock%E4%B8%8ECondition.html#概述" class="toc-sidebar-link">概述</a></li><li class="toc-sidebar-sub-header"><a href="/md/concurrent/source/2020-03-30-016-%E6%B5%85%E8%B0%88AQS%E4%B8%AD%E7%9A%84ReentrantLock%E3%80%81ReentrantReadWriteLock%E3%80%81StampedLock%E4%B8%8ECondition.html#代码示例" class="toc-sidebar-link">代码示例</a></li></ul></li><li><a href="/md/concurrent/source/2020-03-30-016-%E6%B5%85%E8%B0%88AQS%E4%B8%AD%E7%9A%84ReentrantLock%E3%80%81ReentrantReadWriteLock%E3%80%81StampedLock%E4%B8%8ECondition.html#reentrantreadwritelock" class="toc-sidebar-link">ReentrantReadWriteLock</a><ul class="toc-sidebar-sub-headers"><li class="toc-sidebar-sub-header"><a href="/md/concurrent/source/2020-03-30-016-%E6%B5%85%E8%B0%88AQS%E4%B8%AD%E7%9A%84ReentrantLock%E3%80%81ReentrantReadWriteLock%E3%80%81StampedLock%E4%B8%8ECondition.html#概述-2" class="toc-sidebar-link">概述</a></li><li class="toc-sidebar-sub-header"><a href="/md/concurrent/source/2020-03-30-016-%E6%B5%85%E8%B0%88AQS%E4%B8%AD%E7%9A%84ReentrantLock%E3%80%81ReentrantReadWriteLock%E3%80%81StampedLock%E4%B8%8ECondition.html#代码示例-2" class="toc-sidebar-link">代码示例</a></li></ul></li><li><a href="/md/concurrent/source/2020-03-30-016-%E6%B5%85%E8%B0%88AQS%E4%B8%AD%E7%9A%84ReentrantLock%E3%80%81ReentrantReadWriteLock%E3%80%81StampedLock%E4%B8%8ECondition.html#stampedlock" class="toc-sidebar-link">StampedLock</a><ul class="toc-sidebar-sub-headers"><li class="toc-sidebar-sub-header"><a href="/md/concurrent/source/2020-03-30-016-%E6%B5%85%E8%B0%88AQS%E4%B8%AD%E7%9A%84ReentrantLock%E3%80%81ReentrantReadWriteLock%E3%80%81StampedLock%E4%B8%8ECondition.html#概述-3" class="toc-sidebar-link">概述</a></li><li class="toc-sidebar-sub-header"><a href="/md/concurrent/source/2020-03-30-016-%E6%B5%85%E8%B0%88AQS%E4%B8%AD%E7%9A%84ReentrantLock%E3%80%81ReentrantReadWriteLock%E3%80%81StampedLock%E4%B8%8ECondition.html#代码示例-3" class="toc-sidebar-link">代码示例</a></li></ul></li><li><a href="/md/concurrent/source/2020-03-30-016-%E6%B5%85%E8%B0%88AQS%E4%B8%AD%E7%9A%84ReentrantLock%E3%80%81ReentrantReadWriteLock%E3%80%81StampedLock%E4%B8%8ECondition.html#condition" class="toc-sidebar-link">Condition</a><ul class="toc-sidebar-sub-headers"><li class="toc-sidebar-sub-header"><a href="/md/concurrent/source/2020-03-30-016-%E6%B5%85%E8%B0%88AQS%E4%B8%AD%E7%9A%84ReentrantLock%E3%80%81ReentrantReadWriteLock%E3%80%81StampedLock%E4%B8%8ECondition.html#概述-4" class="toc-sidebar-link">概述</a></li><li class="toc-sidebar-sub-header"><a href="/md/concurrent/source/2020-03-30-016-%E6%B5%85%E8%B0%88AQS%E4%B8%AD%E7%9A%84ReentrantLock%E3%80%81ReentrantReadWriteLock%E3%80%81StampedLock%E4%B8%8ECondition.html#代码示例-4" class="toc-sidebar-link">代码示例</a></li></ul></li><li><a 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